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Sources:
http://www.scientificamerican.com/article/what-makes-the-sound-when/
http://cal.vet.upenn.edu/projects/saortho/chapter_86/86mast.htm
http://www.loc.gov/rr/scitech/mysteries/joint.html
http://health.howstuffworks.com/human-body/systems/musculoskeletal/question437.htm
http://www.hopkinsmedicine.org/healthlibrary/test_procedures/orthopaedic/joint_aspiration_92,P07680/
http://www.livescience.com/9729-knuckle-cracking-ig-nobel-prize.html
https://secure.flickr.com/photos/orijinal/4740214235